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EP0180966B1 - Onduleur avec une charge qui force la tension de sortie de l'onduleur à une fréquence et une tension déterminée - Google Patents

Onduleur avec une charge qui force la tension de sortie de l'onduleur à une fréquence et une tension déterminée Download PDF

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Publication number
EP0180966B1
EP0180966B1 EP85114077A EP85114077A EP0180966B1 EP 0180966 B1 EP0180966 B1 EP 0180966B1 EP 85114077 A EP85114077 A EP 85114077A EP 85114077 A EP85114077 A EP 85114077A EP 0180966 B1 EP0180966 B1 EP 0180966B1
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EP
European Patent Office
Prior art keywords
output
converter according
converter
frequency
voltage
Prior art date
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EP85114077A
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German (de)
English (en)
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EP0180966A2 (fr
EP0180966A3 (en
Inventor
Friedrich-Werner Dr.-Ing. Thomas
Gernot Dipl.-Ing. Thorn
Dietrich Prof. Dahlinger
Wolfgang Ing. Sperzel
Guido Ing. Hubertus
Johann Ing. Stürmer
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Balzers und Leybold Deutschland Holding AG
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Leybold AG
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Priority claimed from DE19843441001 external-priority patent/DE3441001A1/de
Priority claimed from DE19843441000 external-priority patent/DE3441000A1/de
Application filed by Leybold AG filed Critical Leybold AG
Publication of EP0180966A2 publication Critical patent/EP0180966A2/fr
Publication of EP0180966A3 publication Critical patent/EP0180966A3/de
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/505—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/515—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/525—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output waveform or frequency
    • H02M7/527—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output waveform or frequency by pulse width modulation

Definitions

  • the invention relates to an inverter with a load that forces an inverter output voltage of a certain curve shape and frequency.
  • Inverters convert direct current into alternating current, with energy flowing from the direct current system into the alternating current system.
  • a distinction is generally made between self-controlled and externally controlled inverters.
  • an external AC voltage source that does not belong to the inverter is required, which provides the commutation voltage for the duration of the commutation.
  • Self-commutated inverters do not require an external AC voltage source for commutation. The commutation voltage is rather provided by an energy storage device belonging to the inverter.
  • the AC voltage generated by self-commutated inverters since it does not depend on an external AC voltage, can be changed over a wide range in terms of its frequency.
  • the load-controlled inverters In addition to the self-controlled and externally managed inverters, a distinction is also made between the load-controlled inverters, which to a certain extent occupy an intermediate position and are once more to be regarded as externally managed and once more as self-managed inverters.
  • the load-controlled inverter In the case of the load-controlled inverter, the load provides the commutation voltage. Since an inverter requires inductive reactive power for natural commutation, the load current must have a capacitive component. This condition can be met by parallel and series resonant circuits or by an overexcited synchronous machine.
  • GTO Gate Turn Off
  • Inverters built with GTO thyristors are therefore quieter and usually smaller than comparable inverters built with other thyristors.
  • conventional GTO circuits often require additional effort in the control circuit and in the protective circuit.
  • the main advantage of the GTO thyristor is that it can be turned off by a reverse control current alone. However, this is at the expense of other properties such as turn-on time, forward dissipation, overcurrent carrying capacity and switching dissipation.
  • the switching power loss increases in direct proportion to the repetition frequency. For this reason, the GTO thyristor generally does not reach the upper repetition frequency of ASCR and RLT thyristors.
  • the switch-off power loss is greater than the switch-on power loss. Since the turn-off power loss occurs with every switching operation, its share of the total power loss becomes more and more noticeable with increasing repetition frequency and must be taken into account with every application of GTOs. (Zeitschrift etz, Volume 104, 1983, No.
  • each switch-off thyristor is provided with its own RCD circuit (see Bösterling, Ludwig, Schimmer and Tscharn: Practice with the GTO, switch-off thyristors for self-commutated converters, reprint by AEG-Telefunken, 1983; Berg, Bösterling and Luse: Switch-off thyristors (GTO) for new converter concepts, company brochure of AEG-Telefunken, 1984).
  • the frequency range for which the known switch-off thyristors can be used is relatively narrowly limited, with frequencies of between approximately 3 and 5 kHz being used as the maximum frequency if the maximum permissible forward current is used to a large extent. Attempts to increase this frequency have always resulted in a corresponding reduction in the maximum permissible forward current, since otherwise the thermal load on the thyristors could no longer be controlled.
  • converters with so-called frequency thyristors are used almost exclusively for the purposes stated above, which require complex commutation aids and make circuitry measures necessary the required close season t. to guarantee.
  • the limitation of the switching frequency to a few kilohertz is also necessary for this type of converter, often accompanied by the measure of reducing the component utilization, ie reducing the switching currents in order not to exceed the power loss permissible for the component.
  • the operating frequency is reduced in accordance with the metal blocks ejected from the inductor, as a function of the fact that the phase angle between the zero crossing of the inverter output current and the next zero crossing of the inverter output voltage is constantly regulated.
  • no turn-off thyristors are provided, and the output current of the inverter is always switched at the zero crossing of the output voltage.
  • an arrangement for supplying an electrical load by means of an inverter is known, this load being an inductance and, with respect to the inverter, being connected in parallel with a capacitor with which it forms an oscillating circuit (DD-Z: Elektrie, vol. 35 (1981 ), Issue 12, pages 651 to 655).
  • DD-Z Elektrie, vol. 35 (1981 ), Issue 12, pages 651 to 655
  • the natural frequency of the resonant circuit essentially coincides with the output frequency of the inverter.
  • the inverter is implemented by means of conventional thyristors, so that complex commutation tools are required.
  • a current inverter which has cut-off thyristors which can block the reverse current (US Pat. No. 4,477,868).
  • This inverter is fed by an external direct current source and in turn supplies rectangular currents.
  • a resonance circuit Connected to this inverter is a resonance circuit which has an inductance which is connected in series with a capacitor.
  • the output voltage of the inverter is at the inductance mentioned.
  • the phase relationship between the output voltage and the output current of the inverter is not regulated. Rather, no phase detection is required in the known converter due to the fixed resonant circuit and the voltage regulation via frequency adjustment. As a result, the switch-off thyristors can only be operated with a limited switching frequency.
  • the invention has for its object to provide an inverter with GTO thyristors, in which the turn-off power loss of the GTO thyristors is drastically reduced.
  • a circuit arrangement is used, by means of which the time between the switch-off pulse of the conductive branch and the switch-on pulse of the other branch can be set in a defined manner.
  • the advantage achieved by the invention is, in particular, that the inverter can be operated at a significantly higher frequency with the load capacity of the switch-off thyristors.
  • the frequency increase is a multiple compared to conventional GTO inverters.
  • the circuit arrangement according to the invention which can be supplemented by the known RCD circuitry, reduces the steepness of the voltage after the current has been switched off to such an extent that the switch-off power loss is reduced to a fraction of the original value.
  • the frequency can be increased considerably with the same thermal load on the components, for example to values substantially above 10 kHz, without the heat dissipation from the switch-off thyristors becoming a problem.
  • limit data that apply to the switch-off thyristor can be used at the same time with the technically common safety distances.
  • the invention is particularly advantageously suitable for heating or melting materials which form part of the load, in particular a parallel resonant circuit. If ferromagnetic materials are used in which the magnetic resistance changes significantly when the Curie temperature is exceeded, the resonant circuit is detuned, but this is compensated for by the readjustment according to the invention.
  • FIG. 1 shows the course of current I and voltage U in a load-controlled thyristor converter over time (abscissa).
  • a phase shift t s between the current and voltage is necessary for reasons of perfect commutation and the reduction of the charge carriers within the so-called free time. This phase shift inevitably entails an increase in switching losses and a frequency limitation, t s being the so-called "closed time”.
  • Figure 2 largely corresponds to Figure 6 in the special print mentioned above "Practice with the GTO shutdown thyristors for self-commutated converters".
  • the current I T drops in accordance with the curve profile shown, and within the same time the voltage U D increases , likewise in accordance with the voltage profile shown.
  • the product of current and voltage leads to the course of the curve that surrounds the hatched area. This in turn is a measure of the high turn-off power loss P aR ' as a result of the steep voltage rise. It can be seen from this that the power loss increases with increasing frequency, so that the operating temperatures of the turn-off thyristors can no longer be controlled.
  • GTO turn-off thyristors
  • FIG. U denotes a DC voltage which is converted into an AC voltage U A by the circuit arrangement 1 according to the invention.
  • At the output of the GTO thyristor converter 2 there is a load which determines the frequency and curve shape of the output voltage U A of the thyristor inverter 2.
  • the output voltage U A of the inverter 2 and the associated output current I A are detected and evaluated by a device 4.
  • This device 4 controls the GTO thyristors of the inverter 2 in such a way that a possible phase shift between U A and I A is canceled.
  • the switch-off current I T has essentially the same profile as in FIG. 2. that the product of I and U to a much flatter curve-comp. the outline of the hatched area leads as in the case of FIG. 2. As a result, the power loss is also much lower, and the circuit arrangement according to FIG. 3 can consequently be operated at significantly higher frequencies when the turn-off thyristors are fully utilized.
  • the voltage curve U o according to FIG. 4 corresponds to a sine line which is forced by the existence of an oscillating circuit.
  • FIG. 5 shows the circuit arrangement according to FIG. 3 again in more detail.
  • a power supply source 5 can be seen here, which is designed as a converter and is supplied with three-phase current via a triple line 6.
  • a DC voltage is generated by a thyristor rectifier 7 and is present on lines 8 and 9.
  • the DC circuit formed in this way has a smoothing choke 10, a smoothing capacitor 11 and an intermediate circuit choke 12.
  • inverter 2 which is equipped with turn-off thyristors (GTOs).
  • GTOs turn-off thyristors
  • This inverter is controlled by a clock 13.
  • Frequency control of inverters is already known as such (GB-PS 13 68 216, GB-PS 14 94 338, DE-OS 32 37 716, DE-Z: Sie mens brochure, thyristor-controlled resonant circuit converter for inductive heating systems, Order No.E 238/1951; DD-Z: Elektrie, volume 35, 1981, pages 651-655).
  • no GTO thyristors are used in these controls and, moreover, no exact phase equality between current and voltage is sought, but a phase shift is always deliberately brought about.
  • the output of the inverter 2 leads via lines 14 and 15 to an inductor 16, which in the present case is designed as a cylindrical induction coil.
  • the material to be treated and / or melted can be accommodated in this coil 16, as a result of which the entire load receives an additional ohmic component, which is represented here by an equivalent resistor 17 connected in series.
  • a capacitor 18 is arranged parallel to the inductor 16, based on the inverter 2, which complements the inductor 16 to form a resonant circuit which is designed, for example, for a frequency of 20 kHz.
  • the inductor 16 can be accommodated in a chamber, not shown, in which the required atmosphere is maintained, which can also consist, for example, of a vacuum and / or an inert gas.
  • Taps 19 and 20 for the voltage U A and the current I A are assigned to the lines 14 and 15.
  • the taps 19 and 20 are connected to a control arrangement 21, the output of which is in turn connected to a clock generator 13.
  • the sign and amount of the phase shift between U A and I A are recognized and converted by means of an integration element into a sign-correct output signal which is proportional to the phase shift.
  • This serves as an input signal for the clock generator 13, which is designed as a voltage-frequency converter. In other words, the output frequency of the clock 13 is proportional to the input voltage.
  • the clock 13 is equipped with a further input 22, by means of which, for example, manual adjustment of the output frequency of the clock 13 is possible.
  • a further input 22 by means of which, for example, manual adjustment of the output frequency of the clock 13 is possible.
  • the output voltage of the control arrangement 21 rises due to the leading current, the output frequency of the inverter 2 is raised, and the thyristors are fired earlier. This leads to the fact that the phase shift is corrected to the smallest possible value caused by control deviation.
  • the output voltage of the control arrangement 21 drops due to disadvantageous current, the output frequency of the inverter 2 is regulated down and the thyristors are fired later. In this way, the phase shift and also the reactive power are reduced to the lowest possible value.
  • an adaptation device 25 for shifting the switch-on pulses relative to the switch-off pulses of the switch-off thyristors. This shift is described in more detail in connection with the following figures.
  • FIGs. 6 details of the inverter 2 are shown.
  • This has a total of four turn-off thyristors 27, 28, 29, 30 arranged in a bridge circuit. Since these turn-off thyristors 27-30 are not reverse-blocking in the present case, fast-blocking diodes 31, 32, 33, 34 are assigned to them in series connection.
  • simple shutdown capacitor networks so-called RCD elements 35, 36, 37, are assigned to the switch-off thyristors for protection against impermissible dynamic stress, but only one of them is provided with reference numbers. These RCD elements 35, 36 37 are not absolutely necessary, however, together with the arrangement according to FIGS. 3 and 5 bring surprising effects.
  • the inverter 2 is connected to two busbars 38, 39, to which various oscillating circuits containing the inductance 16 and the capacitance 18 or electrical machines can be connected.
  • the resonant circuit which is shown in the right part of FIG. 5, can be connected directly to the busbars 38 and 39.
  • 6 shows two alternative possibilities of how the resonant circuits in question can be connected via transformers 41 and 42, respectively.
  • the inductance 16 itself represents the consumer, i.e. analogously to the arrangement in FIG. 5, it forms an induction coil in which the material to be heated is accommodated.
  • the resulting ohmic resistance is indicated by the equivalent resistor 17.
  • a rectifier bridge 43 is connected in parallel to the latter, which leads to a load 45 in the form of an ohmic resistor.
  • the inductance 16 also present here does not necessarily have to be the actual consumer.
  • the ohmic load 45 can be, for example, a heating resistor for a resistance furnace.
  • a smoothing capacitor 44 here largely smoothes the output voltage of the rectifier bridge 43.
  • the inverter 2 is controlled via the four-way control line 24 in such a way that the turn-off thyristors 27, 30 and the turn-off thyristors 28, 29 are switched to pass. Especially when the frequencies are increased still further, it is expedient to switch on the turn-on thyristors 27, 30 to be placed such that they are at a time interval from the preceding switch-off pulses of the other switch-off thyristors 28, 29 and vice versa. The time interval must correspond to the deletion delay time and the deletion time. This is explained in more detail below.
  • the adaptation device 25 is provided, which is also connected to a device 23 for potential isolation and pulse shaping via a multiple control line 26.
  • FIG. 7 shows a circuit arrangement which essentially represents a specification of the control arrangement 21 according to FIG. 5.
  • the output voltage U A and the output current I A are supplied via resistors 46 and 49, comparators 48 and 51, the second input of which is connected to ground via a resistor 47 and 50, respectively.
  • the comparators 48, 51 are connected via a detection circuit 56 to a differential amplifier 57 and a phase controller 58.
  • the output signal of the phase regulator 58 passes via line 83 to the already mentioned clock generator 13, which is designed as a voltage-frequency converter.
  • the comparators 48, 51 are followed by diodes 52, 53, so that only positive signals are forwarded to the detection circuit 56.
  • the cathode of the diode 53 is grounded via a resistor 55 and is also connected to an input of a NAND element 60 and an input of a memory, a flip-flop 62. This input of the flip-flop 62 is labeled C.
  • the cathode of the diode 52 is connected to ground via a resistor 54 and is simultaneously connected to another input D of the flip-flop 62 and via a negation element 59 to another input of the NAND element 60.
  • the flip-flop has a memory function here and is therefore framed by dashed lines and designated 85. Another component could also serve as the memory 85.
  • the output of the NAND element 60 leads to a negation element 61, the output of which is in turn guided to a further NAND element 63 or 64.
  • the second input of the NAND gate 63 is connected to the Q output of the flip-flop 62, while the second input of the NAND gate 64 is connected to the Q output of the flip-flop 62.
  • the output of the NAND element 64 is at the input of a negation element 66, which is connected to an input of a differential amplifier 77 via resistors 69, 73 connected in series.
  • the output of the NAND gate 63 is connected to another input of the differential amplifier 81 via a negation gate 65 and the resistors 70, 74 connected in series.
  • a capacitor 71 or 72 is connected to the connecting line between the resistors 69, 73 or 70, 74 and is connected to ground.
  • the connection line between resistor 74 and amplifier 77 is connected to ground via a resistor 76.
  • the output of the differential amplifier 77 which is fed back via a resistor 75, is connected to the integrating element 58, specifically via a resistor 78.
  • This integrating element contains an operational amplifier 81 with a fed-back capacitor 82, the one input of the operational amplifier 81 having a resistor 80 is connected, which is connected to ground.
  • the other input of the operational amplifier 81, to which the feedback capacitor 82 and the resistor 78 are also connected, is connected to the one input via a capacitor 79.
  • the detection circuit 56 With the aid of the detection circuit, it is possible to determine a current or voltage advance with the correct sign and to determine the amount of this advance. Since the components of the detection circuit 56 are digital components which are known per se and whose mode of operation is known, a more detailed description of the signal processing is unnecessary. However, it should be noted that the outputs 67, 68 of the detection circuit 56 send such signals to the amplifier 77 that a positive or negative voltage is present at its output, the amplitude of which is proportional to the phase shift.
  • the phase controller 58 has an I behavior, in addition to the capacitor 82, in the feedback.
  • the circuits 56 and 57 measure the actual value of the phase shift. Since the setpoint is zero, it does not need to be specified. It is important that the entire arrangement operates at the actual frequency of the inverter 2.
  • FIG. 8 shows how the ratio of the on and off pulse is selected. 8 essentially corresponds to FIG. 4; only the pulses P 1 and P 2 are added.
  • an extinguishing delay time t Lv extends approximately to the moment at which the current I T drops steeply (point K l ). This erase delay time is typically about 4 microseconds in the common turn-off thyristors.
  • the so-called extinguishing time t L extends to the point K 2 , at which the curve for the current I T has a further significant kink.
  • the current that occurs behind this kink is also referred to as the tail current.
  • the time in which this current becomes zero is called the tail time.
  • the deletion time is calculated from the time from the switch-off pulse P 1 to the point when the Through current I T minus the so-called tail time. This extinguishing time is approximately 7 microseconds in the case of commercially available shutdown thyristors.
  • the switch-on pulse P 2 of the other group is now placed in a time range which lies between the deletion delay time t Lv and the deletion time t L , as shown in FIG. 8.
  • Such a measure becomes significantly more important as the commutation frequency increases, since the increasing turn-off losses are also reduced with increasing frequency.
  • the temporal spacing of the pulses P 1 and P 2 from one another can be changed within certain limits by the aforementioned adaptation device 25.
  • FIG. 9a shows the switch-off thyristors according to FIG. 6 again in a simplified representation in order to illustrate the switch-on and switch-off processes with reference to FIG. 9b.
  • the switch-off process at thyristor 27 is shown in the upper region 90 of FIG. 9b. This process can already be seen in FIGS. 4 and 8.
  • the area 91 in FIG. 9b also shows the time profile of the switch-off pulse shown schematically, which is formed by the current I G27 at the control grid of the thyristor 27.
  • the hatched area 94 enclosed by the current 1 G17 can be referred to as a "switch-off pulse".
  • the length of the pulse depends on the type of generation. As can be seen in area 92 of FIG. 9b, the switch-on pulse is circumscribed by the current at the control grid of thyristor 29.
  • the intermediate circuit choke 12 which forces a current, would push the current further and would result in an excessive voltage across all thyristors.
  • An essential component of the invention is therefore an easy adjustment option such that the time interval between the extinguishing pulse and the ignition pulse is always at most equal to the extinguishing time t L and minimally the extinguishing delay time t Lv .
  • the circuit 25 according to FIG. 5 is shown in more detail in FIG. 10.
  • the circuit 25 has a device 100 for adjusting the rising edge of a pulse, as well as a device 101 for adjusting the falling edge and a device 102 for temporally shifting the adjusted pulses as a whole.
  • FIG. 11 shows details of the arrangement shown in FIG. 10.
  • the pulse generator 13 gives impulses to an upper and a lower branch, both branches being constructed in the same way, so that only the structure and the mode of operation of one branch are to be described.
  • a pulse coming from the pulse generator 13 is fed via a resistor 103 to a comparator 107 and directly to a NAND gate 111.
  • a capacitor 109 is connected to ground from the input of the comparator 107, at which the resistor 103 is located.
  • a voltage rising according to an e-function is formed across this capacitor 109.
  • the comparator Via the tap of a resistor 105, the comparator is supplied with a reference voltage at the other input, by means of which the switching threshold of the comparator 107 can be adjusted.
  • the output of the comparator 107 is connected to a second input of the NAND gate 111 already mentioned.
  • the pulse which can be adjusted with its steep flank, is inverted at the resistor 113, which is connected directly to the output of the NAND gate 111.
  • This pulse is processed by the comparator 117, which is connected in the same way as the comparator 107, again in the form described above and passed to an input of the NAND gate 121.
  • the other input of NAND gate 121 is directly connected to the output of NAND gate 111.
  • a pulse is present at the output of the NAND gate, the falling edge of which can be shifted via resistor 115.
  • the output of the NAND gate 21 is connected via a controllable resistor, with which the entire pulse can be shifted, to a capacitor 125 connected to ground and to an inverter with a Schmitt trigger input 127, which in turn leads to two amplifiers 129 and 131 leads. Lines 133, 135 lead from these amplifiers 129, 131 to the device 23.
  • the device 23 is shown again in more detail. This device 23 has identical circuit arrangements for driving the thyristors 28, 29 and 27, 30, for which reason only one is described. Potential isolators 142, 143 each having two inputs and two two outputs are provided.
  • the outputs 173 of the potential isolator 143 are connected to the base or the emitter of a transistor 151, while the corresponding outputs 172 of the potential isolator 142 are connected to the base or the emitter of a further transistor 171.
  • the outputs of the potential separators 143, 142 are analogous to the Transistor 150 and 170 connected.
  • the transistor 151 is connected to one pole of a DC voltage source 147, the other pole of which is connected to the emitter of the transistor 171 via an inductance 155.
  • the collector of transistor 150 is connected to a further DC voltage source 146, the negative pole of which is connected to the emitter of transistor 170 via an inductor 154.
  • a diode 159 is located between the emitter of transistor 151 and the collector of transistor 171 in the direction of flow.
  • a diode 158 is connected between the transistors 150 and 170.
  • a capacitor 167 which is connected to the cathode of the diode 159, leads to a connection of the thyristor 27.
  • a capacitor 166 is connected to the cathode of the diode 158, which leads to a connection of the thyristor 30.
  • the anode of the diode 159 and the output-side connection of the capacitor 167 are connected to one another via a resistor.
  • a resistor 162 connects the diode 158 to the capacitor 166.
  • the transistor 151 is turned on by a pulse on the circuit arrangement 143, as a result of which the capacitor 167 is charged via the diode 159 and the cathode path of the thyristor 27. If the capacitor 167 is charged, the current can continue to flow through the resistor 163 until the transistor 151 is blocked. This turns on the thyristor 27. Alternating to the pulse at transistor 151, transistor 171 receives a pulse from circuit arrangement 142. The transistor 171 then switches on and the capacitor 167 discharges via the transistor 171, the inductance and the gate-cathode path of the thyristor 27. The GTO thyristor 27 is switched off. The inductance serves to limit the turn-off gate current di / dt.
  • thyristors 30 and 28 and 29 are also switched on.
  • the control lines leading to the cathodes are each designated C, while the lines leading to the control grids are designated G.

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Claims (22)

1. Onduleur comportant une charge qui fournit une tension de sortie d'onduleur de courbe et de fréquence déterminées, avec un circuit (4) pour la commande de la phase entre la tension de sortie (UA) et l'intensité de sortie (IA), caractérisé en ce que l'onduleur (2) contient des thyristors de coupure (27 à 30) et en ce que le circuit (4) commande l'onduleur de manière à empêcher un déphasage entre l'intensité de sortie (lA) et la tension de sortie (UA) et en ce que l'intensité de sortie (IA) est commandée au passage par zéro de la tension de sortie (UA),
2. Onduleur selon la revendication 1, caractérisé en ce que la charge est un circuit oscillant dont la fréquence de résonance détermine la fréquence de l'onduleur (2).
3. Onduleur selon la revendication 2, caractérisé en ce que le circuit oscillant est un circuit oscillant parallèle (16, 17, 18).
4. Onduleur selon la revendication 1, caractérisé en ce que la charge est une machine électrique.
5. Onduleur selon la revendication 1, caractérisé en ce qu'on prévoit un dispositif (21, 13, 25, 23) qui adpate la fréquence à laquelle sont commandés les thyristors de coupure (27-30) à la fréquence qui est déterminée par la charge.
6. Onduleur selon la revendication 5, caractérisé en ce que le dispositif (21, 13, 25, 23) compare entre elles les phases de l'intensité de sortie (IA) et la tension de sortie (UA) et, en cas de déphasage, adapte la fréquence à laquelle sont commandés les thyristors de coupure (27-30) à la fréquence qui est déterminée par la charge.
7. Onduleur selon la revendication 6, caractérisé en ce qu'on prévoit des prises (20) pour l'intensité de sortie (lA) et des prises (14, 19) pour la tension de sortie (UA), par des comparateurs (48, 51) correspondants d'un circuit de détection (56) pour la détection du signe et de la valeur du déphasage et en ce que la sortie du circuit de détection (56) est reliée à un organe d'intégration (58), pour la production d'un signal de sortie, proportionnel au déphasage et tenant compte du signe, qui sert de signal d'entrée à une horloge (13) se présentant sous la forme d'un convertisseur tension-fréquence, de manière que par la fréquence de sortie de l'horloge (13), la fréquence de l'onduleur (2) soit réglée de façon à ramener le déphasage à une valeur aussi faible que possible.
8. Onduleur selon la revendication 7, caractérisé en ce qu'on prévoit un circuit de détection de phase (84) qui comporte une bascule bistable (62) qui reçoit la tension de consigne et l'intensité de consigne à la sortie de l'onduleur (2), à une entrée séparée, qui comporte en outre une porte NON-ET (60) à laquelle l'intensité de consigne à la sortie de l'onduleur (2) est envoyée directement et la tension de consigne à la sortie de l'onduleur (2) est envoyée, par un organe de négation (59), les deux sorties de la bascule bistable (62) étant données chacune à une première entrée de deux portes NON-ET (63, 64) dont la deuxième entrée est reliée à la sortie de la porte NON-ET (60, 61) citée.
9. Onduleur selon la revendication 1, caractérisé en ce qu'on prévoit un circuit qui applique l'impulsion de coupure (Pi) pour un thyristor de coupure (27-30), à la grille de commande d'un thyristor de coupure (27-30) plus tôt, d'une temporisation d'effacement (tLv), par rapport au passage par zéro de la tension alternative de sortie (UA),
10. Onduleur selon la revendication 1, caractérisé en ce que les impulsions de mise en circuit (P2), dans le cas de thyristors de coupure (27, 30 ou 29, 28) commandés en alternance, se trouvent à un intervalle de temps des impulsions de coupure (Pi) des autres thyristors de coupure (27 par rapport à 29 ou 28 par rapport à 30), cet intervalle de temps étant supérieur/égal à la temporisation d'effacement (tLv) et inférieur/égal au temps d'effacement (tL).
11. Onduleur selon la revendication 3, caractérisé en ce que le circuit d'oscillation parallèle contient une inductance (16) et une capacité (18), l'inductance (16) ou la capacité (18) faisant partie intégrante d'un récepteur.
12. Onduleur selon la revendication 3, caractérisé en ce que le circuit oscillant parallèle contient une inductance (16) et une capacité (18), l'inductance (16) étant séparée, dans sa construction, du récepteur.
13. Onduleur selon la revendication 1, caractérisé en ce que la charge (16,17,18) est accouplée à l'onduleur (2), par un transformateur (41, 42).
14. Onduleur selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'on prévoit un dispositif d'adaptation (25) qui comporte un dispositif (100) en vue d'ajuster les flancs de montée d'une impulsion, ainsi qu'un dispositif (101) en vue d'ajuster les flancs de descente et un dispositif (102) pour le décalage dans le temps des impulsions ajustées.
15. Onduleur selon la revendication 14, caractérisé en ce que les dispositifs (100, 101) destinés à ajuster les flancs de montée et de descente, comportent des comparateurs (107, 108, 117, 118) dont le seuil de commande est réglable.
16. Onduleur selon la revendication 15, caractérisé en ce que les comparateurs (107, 108; 117, 118) sont reliés à une entrée d'un condensateur (109, 110; 119, 120) relié à la masse.
17. Onduleur selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'on prévoit une résistance (123,124) réglable, en aval de laquelle est monté un condensateur (125,126) relié à la masse ainsi qu'un inverseur (127, 128) avec une entrée je bascule de Schmitt.
18. Onduleur selon la revendication 17, caractérisé en ce que la sortie de l'inverseur (127, 128) est reliée à des amplificateurs d'attaque (129, 131; 130, 132) qui agissent sur un dispositif de commande de thyristor (23).
19. Onduleur selon une ou plusieurs des revendications précédentes, caractérisé en ce que le dispositif de commande de thyristor (23) comporte des circuits de séparation (140-143) qui partagent un signal d'entrée sur deux sorties (172, 174 ou 173, 175), la première sortie (172) d'un circuit de séparation (142) commandant un premier transistor (171) et la deuxième sortie (174) de ce circuit de séparation (142) commandant un deuxième transistor (170) et la première sortie de l'autre circuit de séparation (143) commandant un troisième transistor (151) et la deuxième sortie de l'autre circuit de séparation (143) commandant un quatrième transistor (150).
20. Onduleur selon la revendication 19, caractérisé en ce que les émetteurs du premier et du deuxième transistor (171, 170) sont reliés au collecteur d'un thyristor GTO (27, 30), par une inductance (155, 154), tandis que son collecteur est relié à la grille de commande de ce thyristor GTO (27, 30), par un condensateur (167, 166).
21. Onduleur selon la revendication 1, caractérisé en ce qu'on prévoit un circuit RCD (35, 36, 37), parallèle au parcours anode -cathode d'un thyristor GTO (par exemple 27).
22. Onduleur selon la revendication 1, caractérisé en ce que la montée de la tension (UD, U27), fournie par la charge, est très plate, au moins du passage par zéro jusqu'au temps d'effacement (td.
EP85114077A 1984-11-09 1985-11-05 Onduleur avec une charge qui force la tension de sortie de l'onduleur à une fréquence et une tension déterminée Expired - Lifetime EP0180966B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3441001 1984-11-09
DE19843441001 DE3441001A1 (de) 1984-11-09 1984-11-09 Verfahren und anordnung zum beseitigen der blindleistung bei induktiven materialbehandlungsprozessen
DE3441000 1984-11-09
DE19843441000 DE3441000A1 (de) 1984-11-09 1984-11-09 Anordnung zur versorgung einer elektrischen last mittels eines wechselrichters

Publications (3)

Publication Number Publication Date
EP0180966A2 EP0180966A2 (fr) 1986-05-14
EP0180966A3 EP0180966A3 (en) 1987-08-26
EP0180966B1 true EP0180966B1 (fr) 1990-09-05

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EP85114077A Expired - Lifetime EP0180966B1 (fr) 1984-11-09 1985-11-05 Onduleur avec une charge qui force la tension de sortie de l'onduleur à une fréquence et une tension déterminée

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US (1) US4700281A (fr)
EP (1) EP0180966B1 (fr)
DE (1) DE3579556D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010025949A1 (de) * 2010-07-02 2012-01-05 Sms Elotherm Gmbh Ansteuerung eines Wechselrichters

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3927888A1 (de) * 1989-08-24 1991-02-28 Philips Patentverwaltung Wechselrichteranordnung
FR2671929A1 (fr) * 1991-01-18 1992-07-24 Thomson Tubes Electroniques Generateur de chauffage par haute frequence.
DE4209644A1 (de) * 1992-03-25 1993-09-30 Abb Patent Gmbh Verfahren zum Ansteuern der Stromrichterventile eines lastgeführten Parallelschwingkreiswechselrichters eines Induktionsofens
DE4302056A1 (de) * 1993-01-26 1994-07-28 Fraunhofer Ges Forschung Resonanter Wechselrichter
SE514964C2 (sv) * 1999-09-22 2001-05-21 Abb Ab Förfarande och anordning för styrning av släckvinkeln för en nätkommuterad strömriktare
FR2945900B1 (fr) * 2009-05-19 2012-10-26 Schneider Toshiba Inverter Europe Sas Convertisseur de puissance utilisant un redresseur a transistors normalement fermes.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1615126B1 (de) * 1967-12-29 1972-05-31 Aeg Elotherm Gmbh Verfahren zur Beseitigung der Gleichstromerhoehung ueber Nennstrom bei Parallelschwingkreisumrichtern mit steuerbarer Betriebsfrequenz
US3718852A (en) * 1971-07-14 1973-02-27 Gen Electric Phase angle regulator for high frequency inverter
DE2421193A1 (de) * 1973-05-04 1974-11-14 Westinghouse Brake & Signal Inverterkommutierungsschaltung
CA1126812A (fr) * 1977-08-10 1982-06-29 Yasuo Matsuda Appareil convertisseur de puissance
US4280038A (en) * 1978-10-24 1981-07-21 Ajax Magnethermic Corporation Method and apparatus for inducting heating and melting furnaces to obtain constant power
DE3237716C2 (de) * 1982-10-12 1984-09-06 Aeg-Elotherm Gmbh, 5630 Remscheid Wechselrichter für einen Parallel-Schwingkreis-Umrichter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010025949A1 (de) * 2010-07-02 2012-01-05 Sms Elotherm Gmbh Ansteuerung eines Wechselrichters

Also Published As

Publication number Publication date
EP0180966A2 (fr) 1986-05-14
US4700281A (en) 1987-10-13
EP0180966A3 (en) 1987-08-26
DE3579556D1 (de) 1990-10-11

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